Projection display systems utilizing light emitting diodes and light recycling
First Claim
1. A projection display system, comprising:
- a light-recycling illumination system, wherein said light-recycling illumination system further comprises;
a light source for generating light, wherein said light source is at least one light-emitting diode having a reflecting layer, wherein the total light-emitting area of said light source is area AS and wherein said light source has a maximum intrinsic source luminance and;
a light-recycling envelope, wherein said light-recycling envelope encloses said light source and wherein said light-recycling envelope reflects and recycles a portion of said light generated by said light source back to said reflecting layer; and
a light output aperture, wherein said light output aperture is located in a surface of said light-recycling envelope, wherein the area of said light output aperture is area AO, wherein said area AO is less than said area AS, wherein said light source and said light-recycling envelope direct at least a fraction of said light out of said light-recycling envelope through said light output aperture and wherein said fraction of said light exits said light output aperture as uncollimated light having a maximum exiting luminance;
a light-collimating means, wherein said light-collimating means has an input surface that is adjacent to said light output aperture that accepts said uncollimated light, wherein said light-collimating means partially collimates said uncollimated light and wherein said light-collimating means has an output surface through which the partially collimated light is transmitted; and
an imaging light modulator, wherein said imaging light modulator is located in the optical path of said partially collimated light, and wherein said imaging light modulator spatially modulates said partially collimated light to form an image.
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Abstract
A projection display system has at least one light-recycling illumination system and at least one imaging light modulator. The light-recycling illumination system includes a light source that is enclosed within a light-recycling envelope. The light source is a light-emitting diode that emits light, an a fraction of that light will exit the light-recycling envelope through an aperture. The light-recycling envelope recycles a portion of the light emitted by the light source back to the light source in order to enhance the luminance of the light exiting the aperture. The fraction of the light that exits the aperture is partially collimated and is directed to the imaging light modulator. The imaging light modulator spatially modulates the partially collimated light to form an image.
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Citations
34 Claims
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1. A projection display system, comprising:
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a light-recycling illumination system, wherein said light-recycling illumination system further comprises;
a light source for generating light, wherein said light source is at least one light-emitting diode having a reflecting layer, wherein the total light-emitting area of said light source is area AS and wherein said light source has a maximum intrinsic source luminance and;
a light-recycling envelope, wherein said light-recycling envelope encloses said light source and wherein said light-recycling envelope reflects and recycles a portion of said light generated by said light source back to said reflecting layer; and
a light output aperture, wherein said light output aperture is located in a surface of said light-recycling envelope, wherein the area of said light output aperture is area AO, wherein said area AO is less than said area AS, wherein said light source and said light-recycling envelope direct at least a fraction of said light out of said light-recycling envelope through said light output aperture and wherein said fraction of said light exits said light output aperture as uncollimated light having a maximum exiting luminance;
a light-collimating means, wherein said light-collimating means has an input surface that is adjacent to said light output aperture that accepts said uncollimated light, wherein said light-collimating means partially collimates said uncollimated light and wherein said light-collimating means has an output surface through which the partially collimated light is transmitted; and
an imaging light modulator, wherein said imaging light modulator is located in the optical path of said partially collimated light, and wherein said imaging light modulator spatially modulates said partially collimated light to form an image. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19)
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20. A color sequential method of forming a full-color projection display image comprising the steps of:
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dividing the time period for each frame of said full-color projection display image into at least a first sub-frame, a second sub-frame after said first sub-frame, and a third sub-frame after said second sub-frame;
during said first sub-frame, addressing all pixels of an imaging light modulator to set the transmission of said imaging light modulator for light of a first color, emitting said light of first color from a first light source that has a first reflecting layer, recycling a portion of said light of a first color back to said first reflecting layer to increase the effective brightness of said first light source, partially collimating a fraction of said light of a first color, directing the partially collimated said light of a first color to said imaging light modulator and spatially modulating said partially collimated said light of a first color to form a first image;
during said second sub-frame, addressing all said pixels of said imaging light modulator to set said transmission of said imaging light modulator for light of a second color, emitting said light of a second color from a second light source that has a second reflecting layer, recycling a portion of said light of a second color back to said second reflecting layer to increase the effective brightness of said second light source, partially collimating a fraction of said light of a second color, directing the partially collimated said light of a second color to said imaging light modulator and spatially modulating said partially collimated said light of a second color to form a second image; and
during said third sub-frame, addressing all said pixels of said imaging light modulator to set said transmission of said imaging light modulator for light of a third color, emitting said light of a third color from a third light source that has a third reflecting layer, recycling a portion of said light of a third color back to said third reflecting layer to increase the effective brightness of said third light source, partially collimating a fraction of said light of a third color, directing the partially collimated said light of a third color to said imaging light modulator and spatially modulating said partially collimated said light of a third color to form a third image. - View Dependent Claims (21, 22, 23, 24, 25, 26, 27, 28, 29, 30, 31, 32, 33, 34)
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Specification